Relationship between the Yield Strength-Fracture Toughness Balance and the Multiscale Microstructure of a Maraging Stainless Steel for Aircraft Applications

Abstract:

Two grades of Fe-Cr-Ni-Al-Ti-Mo maraging steels, with a different titanium content, were investigated. Particular attention was given to the correlation between the precipitated phases and the yield strength. Synchrotron X-ray diffraction, small-angle neutron scattering and atom probe experiments were performed to determine the crystal structure, shape, size distribution, chemical composition, particle number density and volume fraction of precipitates. Both alloys show a strong increase in strength after an aging treatment, which is attributed to the co-precipitation of two different intermetallic phases. Strengthening by a single precipitation of β-Ni (Al,Ti) particles induces a saturation of yield strength around 1600 MPa above a volume fraction of 6 %. The improvement of yield strength is then obtained by introducing a nanoscale co-precipitation of η-Ni₃(Ti,Al) phase.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 413-418
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.413
• Online since: November 2016
• Authors: Charline Le Nué*, Jean Marc Cloué, Marie Hélène Mathon, Sylvain Puech, Denis Béchet, Denis Delagnes
• Keywords: Intermetallic Precipitation, Maraging Steel, Yield Strength

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